Detection/state precedence

Complex detection should specify precedence, for example:

1. authorization/exclusive gate;

2. disconnect/reset;

3. menu/edit mode;

4. reload/reset event;

5. weapon/profile swap;

6. firing transition;

7. per-shot advance;

8. idle cleanup.

A single transition function is preferable to unrelated blocks all writing current_id, shot_index, or mode.